tifw Fishes I mm Lake Inluri'r. 117 



once to once and .\ as lonj? as tlic eye, the diameter of wliicli 

 is 3i- to 1 times iii leiij;th of liead ; iutcrorlntal width oneo 

 to once and ^ diameter of eye ; m )uth not very (jljliqne, ex- 

 tending; to helow jinterior border of eye ; 3 or 1- series of 

 scak^s on the cheek, (fill-rakers sliort, H or {) on lower part 

 of anterior arch. Dorsal .\\'-X\'l D-IO ; spiiics ecpial from 

 the eif^hth or ninth, or sli;;htly increasing in leiifjth to the last, 

 which measnres .\ to }, lenj;tli of iiead. Anal 111 8-9; third 

 spine stron«;er than dorsals, ^ to r len'jjtli of head. Pectoral 

 as long as head or a little shorter, reaching vertical of origin of 

 anal or a little beyond. Ventral reaching origin of anal or a 

 little beyond. Candal truncate. Caudal peduncle once and 

 \ to once and ^ as long as deep. Scales ctenoid, 31-31 ^"-^ . 

 lat. 1. j^. Females pale olive-brown above, silvery white 

 below ; a brown or black opercular spot ; a brown vertical 

 bar below the anterior third of the eye sometimes present ; 

 ill-dcHned dark cross-bars on the back, barely distinguishable ; 

 dorsal and caudal fins greyi>h, with or without round darker 

 spots ; ventrals and anal bright yellow, the former sometimes 

 l)lackish on the outer border, the latter sometimes with two 

 large orange ocellar spots ; lower half of caudal sometimes 

 bright yellow. Males darker, grey or blackish on the bellv ; 

 dorsal fin grey, the soft portion with round light spots ; 

 ventrals black. 



Thirteen specimens, measuring from 110 to 130 mm., from 

 Bunjako. One of them, a female, has tlie mouth and pharvnx 

 full of eggs, measuring 3 mm. in diameter. 



This species appears to be verv near Ctenochrumis pectoraVis 

 Pfeft'. 



Named after Mr. George Ishmael, Interpreter to the Police 

 Court at Entebbe, to whom Mr. Degen is indebted for 

 valuable assistance during his stay in Uganda. 



Tilapia lar'ialnHs. 



Teeth very small, in A to 8 series in both jaws, outer 

 bicuspid, inner tricuspul. Depth of body 2\ to )t^ times in 

 total length, length of head 2"^^ to 3 times. Upper profile of 

 head curved ; snout broadc r than long, as long as the eve iu 

 the young, twice as long as the eye in the adult ; diameter 

 of eye 3i (young) to (5^ times in length of head, once and ^ 

 to 3 times in interorbital width; mouth small, scarcely 

 oblique, i to jj width of head, extending to between nostril 

 and eye; 2 series of scales on the cheek. Gill-rakers mode- 

 rately long, 17 to 19 on lower part of anterior arch. Dorsal 

 XV1-X\ 11 11-12 ; spines strong, last longest, A or a little 



